diff --git a/kernel/log.cc b/kernel/log.cc
index 09673dc2..1f082603 100644
--- a/kernel/log.cc
+++ b/kernel/log.cc
@@ -238,6 +238,7 @@ void log_cell(RTLIL::Cell *cell, std::string indent)
 // ---------------------------------------------------
 // This is the magic behind the code coverage counters
 // ---------------------------------------------------
+#ifdef COVER_ACTIVE
 
 std::map<std::string, std::pair<std::string, int>> extra_coverage_data;
 
@@ -283,5 +284,7 @@ std::map<std::string, std::pair<std::string, int>> get_coverage_data()
 	return coverage_data;
 }
 
+#endif
+
 YOSYS_NAMESPACE_END